Ingot-stripping mechanism



G. L. DANFORLH, 1R. INGOT STRIPPING MECHANISM,

APPLICATION FILED JUNE 10. l9l8.

G.- LI DANFORTH, JR.

INGOT STRIPPING MECHANiSM.

APPLICATION man JUNE 1o. 191e.

Patented Nov. 29, 1921.

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Y/JW/ @M7 UNITED ,STATES i iATENT OFFICE.

GEORGE L. DANFORTH, JR., 0F CHICAGO, ILLINOIS.

INGOT-STRIPPING MECHANISM.

Application led .Tune 10,

To @ZZ 107mm t may concern.'

Be it known that I, GEORGE L. Danron'rn. Jr., a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Ingot-Stripping Mechanism, of which the following is a specification.

My invention relates to ingot stripping mechanism for use in the manufacture of steel, and has for its particular object the provision of means whereby ingots of the inverted type may be extracted or stripped from the iron molds within which they are cast.

It will be understood that in the past it has been the practice to cast ingots in molds having slopingsides which taper from the bottom upward so that when the ingot is cast it will be larger' at the bottom than at the top, and the usual manner of stripping has been to push the ingot out of the bottom of the mold after first removing the mold and ingot from the base upon which the mold was seated during the pouring operation, or by pulling the mold up olf the ingot and leaving the ingot stand upon the car forming the base of the mold during the pouring operation.

ln order to secure many advantages of cooling, the practice now is to cast the ingots in molds having their large ends at the top, the taper, therefore, running downward and also to place a refractory or insulating top of suitable material on the ingot mold which forms an extension ofthe mold and which is removed after the ingot has sufficiently cooled so that the ingot projects out of the mold at the top, thus enabling the gripping devices of my improved ingot stripping mechanism to securely grasp and hold the ingot.

A further object of my invention is the provision of ingot stripping mechanism which will remove the ingot from the mold at practically one operation and without the necessity `of handling the mold and ingot, or the use of mechanism for-pushing the ingot up through the mold until its top can be gripped by the stripping mechanism and the ingot lifted out of the mold.

A still further object of myl invention is the provision of ingot stripping mechanism which can be used kwith the ordinary or standard stripping devices now in use without the necessity of the installation of addispecification of Letters Patent.

Patented Nov. 29, 1921. uns. serrano. 239,215.

tional lifting mechanism and the consequent expense and loss of time.

My invention consists in the novel arrangement and combination of parts hereinafter described, and will be further and better ni'iderstood by reference to the accompanying drawings forming a part of my specii'ication, and in which- Figure 1 is a sectional view showing the device in position to grip an ingot;

Fig. 2 is a sectional view of the device in a vertical plane at right angles to Fig. 1;

Fig. 3 is a sectional view of the device in the same vertical plane as Fig. 1; and

Fig. t is a sectional view of the device on line 4-4 of Fig.

Referring now specifically to the drawings, and in which like reference characters refer to like parts throughout, an inverted ingot mold 10 is shown within which an ingot 11 is located. Hoisting devices 12, 13, leading to an electric or other hoisting mechanism are secured to the hooked portions 14, 15, of the pair of side frame members 16, 17, 'which in turn are locked to the cross head 1S by pair of dogs 19, 20, the side frame members 16 and 17 being slightly recessed at their upper inside portions and within which the dogs 19, 2Q, lie in locked position of the side frames. Secured to the plunger 21, by means of a key 22 is the stripper yoke 223 to the bottom of which is attached a pair of guide plates E201-, 2V, by means of bolts 2G, 26. The stripper yoke 23 is actuated by a ram or plunger 27 of an ordinary overhead stripper crane, the head 28 of the plunger 21 moving up and down within the chamber 29 in the cross head 18. The pair of side frame members 16, 17, are secured together by means of bolts 30, SO, the side frames 16, 17, fitting around the cylindfical portion of the cross head 18 within which the chamber 29 is formed. 1n each of the side frames 1G, 17, a pair of sloping guideways or pockets is formed, one of such pockets 31 being shown in the side frame member 17 and another pocket 32 being shown in the side frame member 16, each of the pockets registering with one of the others when the side frames are tted together. Slide blocks such as 3B, 3-1 are mounted within cach of the pockets and carry pins 37, 3S, the ends of which are secured to the slide blocks in any suitable manner. Ar pair of ingot grippers or tongs 35 and 36 are pivotally connected by means of pins 39, i0, to the cross head 18,

and have suitable gripping devices or driving bits 41, 42, for gripping an ingot, mounted upon their lower ends. rhe grippers or tongs 35, 36, have apertures in their upper ends through which the pins 37 and 38 pass, so that the movement of the slide blocks within the Vpockets will onen or close the grippers at their lower points as hereinafter described. Counter weights 43 and 44 are secured to the cross head 18 by being pivotally mounted upon the pins 39 and 40, each of the counter weights having a pair of projections on its inner ends, two of such projections 45 and46 being shown in operative relation with the said yoke between a pair of projections 47 and 49 and 48 and 50 respectively integral with said yoke.

In the operation oi the. device it will be understood Vthat the device as a whole is lowered down on top of an ingot, which projects out of the top of the mold by reason of the removal of the refractory top hereto fore described, the stripper yoke 23 and plunger 21 are then forced-down, through the action of the ram 27 a su'liicient distance so the head 28 oi the plunger 21 is below the dogs 19 and 2.0 thus releasing the dogs and allowing them to slip over a suiiicient distance so that the side frames are released and can slide upward over the cylindrical portion of the cross head, the dogs 19 and 2O having their lower outside corners slightly rounded to prevent the side frames from binding oi' catching on the dogs.

By means ot the hoisting apparatus which is secured to the hooked portions et the side frames 14 and 15 through the members 12 and 18, an upward pull. is then exerted which raises the side iframes 1G and 17, the cross head 18 remaining stationary, and causing the slide blocks 3S and 84 to travel downward within the sloping pockets 31 and 82, which thus forces the lower ends of the ingot grippers together so that they grip the top of the ingot 11. If the ingot 11 is loose within the mold 10, a continuation of the hoisting operation will lift the ingot out of the mold and it can then be deposited upon an ingot car or in any other place which may be desired. Ii" the ingot does not come out of the mold easily, or it the mold is raised with the ingot the stripper yoke 23 is forced down on top of the mold by the ram 27 and the mold pushed downward so as to 'lree the mold from the ingot, and the mold will. then drop downward oi its own weight. Or it may be found desirable in practice at the beginning eilt the operation when the plunger 21 is pushed downward, tocontinue this movement until the stripper yoke is in contact with the top of the mold. An upward pull on the side frames 16 and 17 will result in the tongs gripping the ingot as described above, the ram 27 in the meantime exerting a suiiicient pressure on the mold to prevent its being lifted with the ingot, which will result in the ingot being loosened in the mold, and it can then be lifted out of the mold in the usual manner, the pressure of the rain on the yoke in the meantime having been removed. As soon as the pressure of the ram 27 is removed from the stripper yoke 23 the counter weights 43 and 44, which are pivoted to the cross head 18 by the pins 39 and 40, and which engage the stripper yoke on its outside lower portions through tlie projections 45 and 4G will automatically lift the stripper yoke until the head of the plunger 21 comes into contact with the dogs 19 and 20, and willvremain in'this position as long as weight oi' the ingot is upon the ingot tongs. As soon as the ingot is deposited on a car and its weight removed from the tongs the side frames will move downward over the cylindrical portion of the cross head, and the counter weights will move t-lie yoke upward, thus resulting in raising the plunger 21 so that the dogs 19 and 2O are pushed outward by the head 28 of plunger 21 and the side iframes thus locked to the cross head. It will also be understood that by the movements just described the slide blocks to which theV upper ends of the ingot grippers 35 and 3G are secured will move to the top of the sloping pockets thus opening the grippers at the bottom and releasing the ingot. A pair of guide plates 24 and 25 are secured to the lower end of the stripper yoke which serve to guide the stripper yoke into proper position on top of the ingot mold so that the torce is applied directly to the top of the ingot mold. It will thus be apparent that I am able to strip the ingot out of the mold at practically a single operation and without the necessity of movingl the mold and ingot to another loca-tion, and I am thus ableto avoid the necessity of handling the ingot and mold, thus effecting considerable savin of time in the operations desired.

While I have described more or less precisely the detailsrof construction which I employ, I do not wish `to be understood as limiting myself thereto, as I contemplate changes in form and the proportion of parts and the substitution of equivalents as circumstances may suggest or render expedient without departing from the spirit or scope of my invention.

I claim:

1. An ingot stripping mechanism comprising in combination ingot grippingy means, hoisting means secured to said ingot gripping means, and means associated with said ingot gripping means for retaining an ingot mold in position during a portion of the stripping operation.

2. An ingot stripping mechanism comprising in combination hoisting means, ingot gripping means, a stripper yoke, the

said stripper yoke and ingot gripping means being movable in opposite directions relative to each other, and means for exerting force upon said stripper yoke.

3. An ingot stripping mechanism comprising in combination ingot gripping means, hoisting means associated therewith, a stripper yoke, the said stripper yoke and ingot gripping means being movable in opposite directions relative to each other, and means for exerting force on said stripper yoke.

4. An ingot stripping mechanism comprising in combination ingot gripping means, means for operating the ingot gripping means, and means for exerting force upon the top of the ingot mold in a downward direction.

5. An ingot stripper mechanism compris ing in combination ingot gripping means, hoisting means associated therewith, a stripper yoke and means for pushing said stripper yoke in a direction opposite to the direction of travel of the ingot gripping means whereby force in a downward direction is exerted upon the top of the ingot mold.

6. An ingot stripping mechanism comprising in combination, ingot gripping means comprising a pair of side frames having sloping pockets therein, a pair of ingot tongs mounted within said pockets, hoisting mechanism secured to said side trames, and means for exerting a downward pressure upon the ingot mold.

7. An ingot stripping mechanism comprising a combination, a pair or members having angular pockets therein, a second member in operative relation with said pair of first mentioned members, a pair of ingot tongs pivotally secured to said second mentioned member' and having their upper ends mounted within the said pockets, a yoke secured to said second mentioned member, and means for exerting pressure upon said yoke.

8. An ingot stripping mechanism comprising in combination, a member having a pair of side frames secured in operative relation therewith, means for securing the side frame members in operative relation with respect to each other, a pair of ingot tongs pivotally mounted and having their upper ends mounted within pockets formed within said side frame members, a yoke secured to the first mentioned member, and operative connections for said yoke and rst mentioned member.

9. An ingot stripping mechanism comprising in combination, a cross head member, a pair of side frame members having angular pockets therein, operative connections between said cross head and said side frame members, a pair of ingot tongs pivotally mounted on said cross head and having their upper ends mounted within said angular' pockets, a plunger mounted within said cross head, a yoke secured to said plunger and adapted to contact with the top of an ingot mold, and hoisting connections secured to said side frames.

l0. An ingot stripping mechanism comprising in combination, a cross head, a pair of side frame members having inclined guide-Ways therein, a plunger mounted Within the cross head, a stripper yoke secured to said plunger, a pair or' ingot tongs pivotally mounted upon said cross head with their upper ends mounted within the inclined guide-ways, and counterweights in operative relation with the said device for imparting force to the stripper yoke in an upward direction.

ll. An ingot stripping mechanism comprising in combination, a cross head, a pair of side frame members having inclined guide-ways therein, a plunger mounted Within the cross head, a stripper yoke secured to said plunger, a pair of ingot tongs pivotally mounted on said cross head with their upper ends mounted within the inclined guide-ways, and a pair of counterweights pivotally mounted upon said cross head and having operative connections with said stripper yoke for returning the stripper yoke to its normal position.

Signed at Chicago, Illinois, this 23rd day of April, 1918.

GEORGE L. DANFORTl-l, Jn.

Witnesses:

LoUIs J. RoHL, Jr., WM. HnBsoN. 

